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AdderView USB Installation and Use Page 27
Appendix B. Problem Solving
Problem:
Peripherals hang after the AdderView’s channel is changed.
Action:
Ensure that you are using a suitable operating system (see section 2.1). Operating
systems such as versions of Mac OS earlier than 8.6 are known to have associated
problems. Ensure that you are not reading from or writing to USB connected disk
drives whilst you are switching between computers. Ensure that the enumeration
guard time is longer than the longest observed enumeration delay (see section
2.4.1) or ensure that you are not switching between computers during the
enumeration process.
Problem:
Video is fuzzy or smudged.
Action:
Ensure that you are using high quality tri-coax video cables. These can be easily
identified as they are roughly the same thickness as a monitor’s video cable and
often are lightly fluted on the outside of the cable. Use the minimum possible length
of video cables.
Problem:
The on/off key on a Macintosh keyboard doesn’t work.
Action:
Ensure that you have plugged the keyboard into port A and that there are not any
USB hubs connected between the computer and the AdderView.
Problem:
The enumeration delay time seems too long.
Action:
Set the lowest enumeration guard time and remember not to switch away from a
selected computer until the timer or hourglass indicates the end of the enumeration
process.